Screw.



APPLICATION F|}LE 16.1911.

2 SHEETS-SHEE WALTER. MEYNER, or NEW YORK, 11'. Y.

SCREW.

Speciflcatioxi o! Letters 1atent.

Patented Aug.6,1918Q Application flled October 16, 1917. Serial No. 196.872.

in Screws, of which the following is a speeification.

' Mypresent invention has for its ob ect the prov1s1on of a single form of fastening which may be quickly driven alfter the manner of a mail and then turned like a screw to look it in place.

The accompanying drawings illustrate a practical embodiment of the invention, wherein I Figures 1 and 2 are side end edge views 0 the screw, broken away at the center to' show the cross-sectional shapes.

Fig. 3 is a cross-sectional view on line 3-3 of Fig. 1.

Fig. 4 is a view of the screw as first driven into a block of wood.v

Fi 5 is a cross-sectional view ,taken substant1ally on the plane of line 5-5 01 Fig. 4.

Fig. 6 is a. view of the screw as turned to look it in place. I

Fig. 7 is a sectional view taken substantially on the plano of line 7-7 of Fig. 6.

The main shank or body 10 of the screw is substantially circular in cross-section and projecting from two opposite sides of this shank are the segmental screw flanges 11. Thsleaves the 'remainin two apposite sides of the shank substantia y p1ain and free of obstructons, as indicated at 12 so as not to nterfere with the driving of the screw.

To prevent the outstandng screw flanges from obstructng the driving and being injured in such driving operation, they are protected by a guard or shield 13 having a major or maximum diameter 14, in the plano of the axis of the screw flanges. and equa to the diameter of such screw flanges end a minor ,-axis 15 equal to the diameter of the eiroular shank and disposed on the axis of the plain smooth sides 12 of the shank. This guard tapers down to a relatively sharp driving point 16. v

To insure the sorew driv'mg straight end true, there is,provided a beafing 17, extending rearwardly from the guard and formin in efi'ect a continuation thereof. This bearin is of suflciext longitudinal extent to ho (1 the screw to its true course and to force back the fibers of the wood or other material in which the screw is being driveh, suflciently to Prevent them springing back after the guard has passed and so interfering With the passage of the screw flanges. This elongated bearing portion in; eflect gives the fibers a setsuch as to prevent them obstructing the subsequent -passage of the screw flanged portions of the serew.

The shank is provided With a suitiable head by which it may be driven and then be turned to cause the screw flanges to bite inbo the solid material at the minor axis of the bore, the same being here shown as a screw head 18 having a screw driven slot 19. This slot is widened at the top, as indicated, S0 228 to prevent closing of the slot in hammering the screw in place, y

In use, the sorew is simply driven as far OFFICE.

as need be, with a hammer, hke an ordinary na.il and is then turned with a screw driver or other instrument, to look it in its seat. By reason of the guard and bearing portions, the screw drives easily and surely without more apparent eiort tha n an ordinary nail and When driven home may be secured by simply giving t a quarter-turn.

What I claim, is:

A fastening comPrising a shank substantially circular in cross section having two opposite sides substantially plain and free of projeotions, PIOjGCI1 flanges on the remaming two opposite s1 es of the shank, a

sharpened driving point on the entering end of the shank, a relatively smooth transversely, convexly, curved, driving guard and shield extending rearwardly from the point end enlarged on the axis of the flanges to substantiallj elliPtioal form in cross section with a diameter svbstantially equal to such flanged portion of the shank to thereby protect the flanges and form a bore to receive said flanges as the fastening is driven, said shield being extended longltudinally a distance toform a bearing long enough to ins ure straig'ht driving of the fastening a'nd setting of the fibers of the material in which tion in the presence of the subscribing witthe fastening is driven and a head on the nesses, this tenthday of October, 1917.

opposite end of the shank for driving the WALTER MEYNJER. same and for turning it to carry the flanges Witnesses: into soliti material. MARION HAYS,

In testimony whereof I, WALTER MJEY- E. MEYNER,

NER, have signed my name to this specifica- LOUIS PASTORINI. 

